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90 - 90 = 0
90 - 72 = 18
90 - 55 = 35
180 minus 66 minus 90 = 24.
90 - 20% = 72
90 is 100 minus 10 so it's C minus X then XC
90.
30 minus 90 is negative 60, if I'm correct.
90/5 = 1818/2 = 9
90 - 6 = 84
3.36 - 90 = -86.64
90 - 45 = 45
90 - 80 = 10
90 - 70 = 20
1115 - 90 = 1025
45